Somari

Original Caption Released with Image:
VOLCANIC EXPLOSION ON IO: Voyager 1 acquired this image of Io on March 4 at 5:30 p.m. (PST) about 11 hours before closest approach to the Jupiter moon. The distance to Io was about 490,000 kilometers (304,000 miles). An enormous volcanic explosion can be seen silhouetted against dark space over Io's bright limb. The brightness of the plume has been increased by the computer as it is normally extremely faint, whereas the relative color of the plume (greenish white) has been preserved. At this time solid material had been thrown up to an altitude of about 100 miles. This requires an ejection velocity from the volcanic vent of about 1200 miles per hour, material reaching the crest of the fountain in several minutes. The vent area is a complex circular structure consisting of a bright ring about 300 kilometers in diameter and a central region of irregular dark and light patterns. Volcanic explosions similar to this occur on the Earth when magmatic gases expand explosively as material is vented. On Earth water is the major gas driving the explosion. Because Io is thought to be extremely dry, scientists are searching for other gases to explain the explosion. JPL manages and controls the Voyager Project for NASA's Office of Space Science.

source:http://photojournal.jpl.nasa.gov/catalog/?IDNumber=PIA01971

TIFF verion:http://photojournal.jpl.nasa.gov/tiff/PIA01971.tif

Questa immagine o filmato è stato catalogato dal Jet Propulsion Lab della National Aeronautics and Space Administration (NASA) degli Stati Uniti d'Americacon il Photo ID: PIA01971. Questo tag non indica lo status del copyright dell'opera ad esso associato. È quindi richiesto un normale tag di copyright. Vedi Commons:Licenze per maggiori informazioni. Altre lingue: العربية ∙ беларуская (тарашкевіца) ∙ български ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ English ∙ español ∙ فارسی ∙ français ∙ galego ∙ magyar ∙ հայերեն ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ polski ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ Türkçe ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−

Licenza

	Sto file multimedial el xe 'ntel publico dominio parché el xe stà creà da la NASA. La polìtega del dirito d'autor de la NASA xe che «el material de la NASA no'l xe proteto dal dirito d'autor via de quando altrimenti spesificà». (Polìtega del dirito d'autor de la NASA e polìtega de l'uso de le imagini del JPL Image Use Policy)
	Ocio: L'uso dei loghi de la NASA (passati e presenti) xe sotoposto a restrission. El sito internet de la NASA el contien un gran nùmaro de imagini prodote da l'Agensia Spassial Soviètega o da altre agensie spassiali. Lore no le xe necessariamente 'ntel publico dominio. El material che vien dal telescopio spassial Hubble el pole èssar sogeto a dirito d'autor se no'l vien esplicitamente dal Space Telescope Science Institute. (HubbleSite - Copyright Notice) Tuto l material che vien da la sonda SOHO el xe sogeto al dirito d'autor e ghe vole na autorixassion par l'uso comerciale e non educativo. (SOHO Copyright Notice) Le imagini che vien dal sito Astronomy Picture of the Day (apod.nasa.gov) le pole èssar sogete al dirito d'autor. (About image permissions)